<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
    console.log(typeof 123);
    console.log(typeof "123");
    console.log(typeof true);
    console.log(typeof NaN);
    console.log(typeof []);
    console.log(typeof {});
    console.log(typeof Math.abs);
    console.log(typeof undefined);
</script>

</body>
</html>